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XRP6272ITC5TR-F Datasheet(PDF) 8 Page - Exar Corporation |
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XRP6272ITC5TR-F Datasheet(HTML) 8 Page - Exar Corporation |
8 / 13 page X XR RP P6 62 27 72 2 2 2A A 5 5V V--A Ad djju us stta ab blle e L Lo ow w D Drro op po ou utt V Vo olltta ag ge e R Re eg gu ulla atto orr © 2011 Exar Corporation 8/13 Rev. 1.2.0 Fig. 22: PSRR Curve APPLICATION INFORMATION The XRP6272 is a low-dropout voltage regulator with low quiescent current, low noise and high PSRR. It can support load current up to 2A. It incorporates current-limit and thermal protection features. TYPICAL APPLICATION SCHEMATIC PROGRAMMING THE OUTPUT VOLTAGE XRP6272’s internal feedback resistors set the output voltage VOUT to 5V when the ADJ pin is connected to GND. Alternatively; the output voltage is adjustable via the external feedback resistor network R1 and R2 by calculating the following formula: 1 R1 R2 where, VREF is the reference voltage set internally at 0.7V nominal. INPUT & OUTPUT CAPACITORS XRP6272 is optimized for use with ceramic capacitors. To ensure stability of the device, an output ceramic capacitor of at least 4.7µF or 10µF (for VOUT ≤ 1.8V) is recommended. An input capacitor of 4.7µF is recommended. X5R or X7R ceramic capacitors are recommended as they have the best temperature and voltage characteristics. NOISE BYPASS CAPACITOR A 22nF bypass capacitor at BP pin can reduce output voltage noise. This pin can be left floating if it is unnecessary. THEORY OF OPERATION SHUTDOWN By connecting EN pin to GND, the XRP6272 can be shutdown to reduce the supply current to 0.01μA (typ.). In this mode, the output voltage of XRP6272 is equal to 0V. CURRENT LIMIT The XRP6272 includes current limit protection feature, which monitors and controls the maximum output current. If the output is overloaded or shorted to ground, this can protect the device from being damaged. THERMAL PROTECTION The XRP6272 includes a thermal protection feature that protects the IC by turning off the pass transistor when the maximum junction temperature TJ exceeds 150ºC. |
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